第15题: [单项选择]在下面的4个关键字中用来说明虚函数的是 A. virtual B. public C. protected D. private 参考答案:A 答案解析:[解析] C++中说明虚函数的方法为:virtual<类型说明符><函数名>(<参数表>);。其中,被关键词virtual说明的函数称为虚函数。
第20题: [单项选择]Recently archaeologists have strived (to develop) theories, (based on) archaeological (evident), that (explain) societal changes such as the development of farming. A. to develop B. based on C. evident D. explain 参考答案:C